sideshowbarker d7053a8eb8 LibCore: Don’t pass O_CLOEXEC to shm_open ...

Bug: Ladybird crashes on launch on macOS 26.4+ with “UNEXPECTED ERROR:
close: Bad file descriptor” in SharedVersion.cpp — because
AnonymousBuffer creation fails.

Cause: anon_create() passed O_CLOEXEC in the oflag argument to shm_open.
macOS 26.4+ rejects that with EINVAL. POSIX only specifies O_RDONLY,
O_RDWR, O_CREAT, O_EXCL, and O_TRUNC as valid shm_open flags; on earlier
macOS versions, O_CLOEXEC just happened to also be silently accepted.

Fix: Filter O_CLOEXEC from the oflag argument we pass to shm_open flags,
and instead set FD_CLOEXEC via fcntl — after opening.

2026-03-31 17:21:17 +01:00

24 KiB

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